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Optimal Control Development System for Electrical Drives

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Author(s): Marian GAICEANU | Emil ROSU | Romeo PADURARU | Cristinel DACHE

Journal: Annals of Dunarea de Jos
ISSN 1221-454X

Volume: 31;
Issue: 1;
Start page: 5;
Date: 2008;
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Keywords: optimal control | matrix Riccati differential equation | electrical drive | induction motor

ABSTRACT
In this paper the optimal electrical drive development system is presented. It consists of both electrical drive types: DC and AC. In order to implement the optimal control for AC drive system an Altivar 71 inverter, a Frato magnetic particle brake (as load), three-phase induction machine, and dSpace 1104 controller have been used. Theon-line solution of the matrix Riccati differential equation (MRDE) is computed by dSpace 1104 controller, based on the corresponding feedback signals, generating the optimal speed reference for the AC drive system. The optimal speed reference is tracked by Altivar 71 inverter, conducting to energy reduction in AC drive. The classical control (consisting of rotor field oriented control with PI controllers) and the optimal one have been implemented by designing an adequate ControlDesk interface. The three-phase induction machine (IM) is controlled at constant flux. Therefore, the linear dynamic mathematical model of the IM has been obtained. The optimal control law providestransient regimes with minimal energy consumption. The obtained solution byintegration of the MRDE is orientated towards the numerical implementation-by using azero order hold. The development system is very useful for researchers, doctoralstudents or experts training in electrical drive. The experimental results are shown.
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